Screw threading die



Oct. 30, 1934. E. T. BYssHE ET AL SCREW THREADING DIE Filed Aug. 8, 1952 3 Sheets-Sheet l Oct. 30, 1934. E- T BYSSHE ET AL l 1,979,024

SCREW THREADING DIE Filed Aug. 8, 1952 3 Sheets-Sheet 2 Oct. .30, 1934. v E' T BYSSHE ET AL 1,979,024

SCREW THREADING DIE Patented Oct. 3o, 1934 y 1,979,024

SCREW THREADING DIE Ernest T. Bysshe and Robert vR. Finn, Springfield, Vt., assignors to `iones & Lamson Machine Company, Springeld, Vt., a corporation of Vermont Application August 8, 1932, Serial No. 627,878

17 Claims. (Cl. .l0- 100) This invention relates to screw threading dies scale showing the adjusting mechanism for deand more particularly to that type of dies wheretermining the limiting positions of the chasers. in the chasers or thread cutting elements are Figures 21 and 22 are perspectives of a chaser rockable between closed and opened positions. carrier and chaser.

One of the objects of this invention is to pro- Figure 23 is a detail section on line 23-23 of 30 vide a construction wherein the trunnions and Figure 22, the chaser-retaining block being rechaser or thread cutting element carriers are demoved. mountableso that the individual chasers can be As shown in the drawings the die comprises a adjusted at the bench. body portion l substantially cylindrical in form A` further object is to provide a die which can and having a central axial opening 2 extending G5 be opened either by hand or automatically. therethrough within which the work may extend.

A further object is toprovide for positive open- This body portion is provided with a plurality of ing of the die so that dependence on springs trunnion-receiving bearing openings as at 3 which for this purpose will not be necessary. are arranged in circular series about the axis of V AA still furtherobject is to provide a one piece the body. As shown, four of these trunnion open- Z0 cam member for moving the thread cutting eleings are employed, although more or less might be ment holders. used as desired. Within each of these trunnion- Further objects and advantages will appear bearing openings 3 is pOStiOned a trunnion 4 of a from a more complete description of an embodithread cutting element carrier 5. These carriers ment of this invention disclosed in the accommay be constructed as shown particularly in Fig- I5 panying drawings, of which ures 21, 22 and 23 wherein they are designed to Figures 1 and 2 are front end elevations of the Carry tangent type chasers such as 6. The trundie in closed and opened conditions, respectively. IliOIl DOTOD 4 0f eah Callel iS ShOWll integral Figure 3 is a side elevation, the die being closed. with a body DOIOD '7 and integral With this bOdy e5-25 Figure 4 is a section on line 4-4 of Figure 1. portion is an actuating arm 8. This actuating C0 Figure 5 is a front elevation of the die, the arm has arib portion 9 and aweb portion 10. The chaser carriers being removed. body portion is provided with a dovetail groove 11 Figure 6 is a detail section on line 6--6 of Figfor the reception of the correspondingly shaped y ure 4. part of the chaser 6, and a retaining or clamping vFigures 7 and 8 are sections on the correspondblock 12 provided with a face 13 conforming to C3 jingly numbered section lines of Figure 4. one side of the chaser dove-tail may be secured Figures 9 and 10 are sections on the correspondin DOSOH aS by SCISWS 14 in a Suitable Seat 15 0f ingly numbered section lines of Figure 5. the carrier body to secure the chaser in position.

, f Figure 11 is a detail section on line 11-11 of These cooperating parts are so formed as to X T125 Figure 19. the chaser with the ribs 17, at the ends of which so Figure 12 is a fragmentary plan View of the the thread cutting edges of the chaser are formed, die. making the proper helix angle to the axis of the Figure 13 is a perspective of a cam and latch die body when the carriers are in position with block. their trunnions in the die body trunnion open- 1 40 Figure 14 is a fragmentary plan of a portion of ings 3. 05

fthe die, the cam and latch block being shown in In order to adjust the chasers lengthwise their section. dovetail faces as shown are provided with spaced Figure 15 is a fragmentary perspective of the notches 18 Within which may engage a flange 19 'chaser carrier actuating ring. on a collar 20 threaded on a stud 21 projecting f' 45 Figures 16 and 17 are views similar to Figure from the body of the carrier and spaced from and 100 9, but showing the die opened, respectively, by parallel to the back face of the chaser. The axis retraction of the releasing sleeve, and by moveof each trunnion 4 passes substantially in the ment of the chasers onto the work while the die plane of the rib faces of the chaser so that in all holder is held against movement. angular positions of the carrier these rib faces Figure 18 is a view vsimilar to Figure 14 but will be substantially tangential to the work to los showing the cam block and chaser actuating ring which they may be presented.

in diirerent relative positions. Each of the trunnions, as shown, is provided Figure 19 is a section on line 19-19 of Figwith a portion 25 of reduced diameter between its ure 4. ends with which may be engaged a mating flange 5-5 Figure 20 is a fragmentary section to a larger portion 26 on a retaining ring 27 journaled on the 110 body portion. This retaining ring is provided with a flange 28 which engages about the end portion 29 of each trunnion inwardly of the reduced diameter portion 25 and abuts against an end face of the die body. The ange portion 26 of the retaining ring, as shown in Figure 8, is provided with cut-outs 30 which are normally out of alinement with the trunnions but which may be positioned opposite thereto by turning the retaining ring away from its normal angular position which is shown in Figure 8. When these cut-outs are in registry with the trunnions the carriers may be removed endwise from the die body 1. 'Ihe retaining ring may be held against removal from the body portion at its rear end by means of a ring 35 secured in position, as shown best in Figures 11 and 19, as by screws 36 threaded into the rear end face of the die body 1. on the forward end of the body 1 is a die actuating or cam ring 40 which is provided with cam grooves 41 in its forward face within which engage the ribs 9 on the chaser carriers, these cam grooves being so related to the chaser actuating arms, their sides forming thrust abutments therefor, that rocking of the ring 40 about the axis of vthe die body simultaneously rocks the carriers between die-closed positions, shown in Figure 1, and die-open positions shown in Figure 2. The carriers are normally urged toward die-open positions as by means of a spring 45 seated in an arcuate channel socket in the body 1 as at 46, one end of the spring 45 reacting against the end of the socket and the other against a pin 47 secured to the ring 40.

The carriers may be held in die-closed position, however, as by a latch mechanism. Such a mechanism, as shown herein, comprises a combined latch and cam block 50 shown detached in Figure 13. Two of these combined latch and cam blocks are shown, each being slidably mounted in a slot 51 in an adjusting ring 52. This adjusting ring is journaled on the die body between the actuating ring 40 and the retaining ring 27 and is lheld from axial movement relative to the die body by reason of its position between the rings 27 and 40. The ring 40 is held on the die body by a shoulder portion 55 of the die body. Each block 50 is provided with a latch face and an inclined cam face 61 which cooperate respectively with a latch face 62 and a cam face 63 in a slot 64 in the rear edge of the actuating ring 40.

When each of the blocks 50 is in its forward position relative to the die body, its latch face 60 is engaged by the latch face 62 of the actuating ring 40, as shown in Figure 14, these latch faces being held in contact by the action of the spring 46, and the ring 52 being held against rotation on the body by means which will be described presently. The actuating ring 40 is thus held in die-closed position. To release the Chaser carriers so that they may be moved by the spring to open position it is necessary to first retract the blocks 50 toward the rear face of the die body. This may be accomplished by axial movement of a sleeve 65 which encloses the rear portion of the actuating ring 40 and also encloses the adjusting ring 52 and the trunnion-retaining ring 27. This sleeve 65 is operatively connected to the blocks 50 as by means of bosses such as 66, one of these being shown integral with each of the blocks 50, which is seated in a perforation 67 in the sleeve 65. Thus by moving the sleeve 65 axially of the die and back from its forward face the projections 68 of the blocks 50 0n which the latch faces 60 and the J ournaledcam faces 61 are formed are moved away from the position shown in Figure 14 toward the position shown in Figure 18. The initial movement of the blocks in this direction frees the actuating ring and permits the spring 46 to rotate the ring 40 to die-open position. Should it for any reason be prevented from moving to this position, further axial movement of the block 50 after the release has been effected brings its inclined cam face 61 against the inclined c-am face 63 of the actuating ring 40 and continued axial movement of the sleeve 65 thus acts positively to turn the ring 40 to its released position which is shown in Figure 18. The portion 68 of the block after being moved sufficiently to release the spring substantially lls the width of the slot 64 of the ring so that any rocking motion of the actuating ring is accompanied by an axial motion of the sleeve 65. In order to close the die it is only necessary to push the sleeve 65 forwardly, whereupon engagement of the portion 68 in the slot 64 acts to rotate the actuating ring 40 against the action of the spring 46 until the blocks 50 have been moved forwardly to their latching position. This return of the carriers to die-closed position may also be effected by rocking the ring 40 in die-closing direction to al sufficient extent and this maybe done by means of an actuating handle 70 extending therefrom.

In order to determine the limits of rocking motion of the actuating ring 40, thus to determine the -limits of die open and closed positions, the ring 52 is made adjustable about the axis of the die. An adjusting means for this purpose is shown in detail in Figure 20. The ring 52 is 110 provided with a hole extending therethrough which at its central portion opens into the interior of the ring. One .portion of this hole, as at 76, is threaded and engageable with these threads is the correspondingly threaded portion `115 of a sleeve 77. This sleeve is keyed for rotation to a shaft 78 having at one end a head 79, journaled in the opening 75, and provided with suitablemeans such as a socket of polygonal cross section as 80 to receive a tool with which it may 12() be turned. The keyed connection of the threaded sleeve 77 to the shaft 78, as shown, comprises a ring 81 having key portions 82 engaging notches 83 in the sleeve 77 and splined onto the end of the shaft 78 to which it is secured by a nut 85 125 threaded on the reduced portion 86 of the shaft. Between the head 79 and the threaded sleeve 76 is mounted another sleeve 90 within which the shaft 78 is rotatable and which is provided on one side with suitable rack teeth 91 which mesh 130 with pinion teeth 92 cut into the body portion 1, this body portion being relieved at either side of these teeth 92 so as to permit a rocking movement of the adjusting ring 52 thereon. The

sleeve .65 is provided with a slot as at 95 of suf- 135 cient size to permit a tool to be inserted therethrough and into engagement with the opening 80 in the head 79 so that this adjusting mechanism is accessible for actuation from outside of the die. Similarly the sleeve 65 is provided with 140 a slot 96 in axial alinement with the trunnionretaining ring 27 when the sleeve `65 is in one of its extreme positions, herein shown as the closed die position, in order that a rod may be inserted through the slot and into a perforation 145 97 in the periphery of the ring 27 so that this ring may be turned to release the trunnions or to hold them in operative positions as desired. Means are also provided by which the die may be automatically opened by holding back the ring element carriers as they are fed forward by their engagement with the work. To this end the die body is slidably related to a holder 100, which,

.as shown, is `provided with a central opening 101 within'which the work may extend and which is provided with a counterbored end portion 102 which is slidable over a rearwardly extended vsleeve portion 103 of the die body. This holder `has xed therein the rear ends of headed pins 104, the heads of which ride in openings 105 eX- tended axially through the body 1 intermediate the trunnion bearing openings 3. Two of such Vopenings 105 are shown though more might be used if desired. Between the heads 106 of the pins 104 and the ring 35 secured .to the rear face of the body 1 are positioned coil springs 108 which react between the ring 35 and these heads and tend to hold the body retracted relative to the holder in the position shown in Figure 16. The holder 100 has an enlarged end head portion 110 within which the rear ends of the pins 104 i are Asecured as by means of cross pins 111 therein arranged in slots 112 in the head 110 and passing through the pins 104. Dowel pins 114 extending from the holder 100 into holes in the body 1 hold the parts against relative rotation. On the outer face of the head 110 rides the rear extremity `0f `the sleeve65, forwardly of which it is provided with a peripheral groove 115 with which -may engage any suitable type of retaining or actuating fork to prevent the forward travel of the sleeve 65 with-the die body when it is desired to cause automatic opening of the die and by actuation of which the die may be opened or closed. Back of the bearing portion of the sleeve `65` on the head 110 this head is shown as provided with an annular abutment 116 which limits the rearward travel of the sleeve 65 thereon to the position shown in Figure 15 wherein the `sleeve 65 has been retracted as by hand to die- `Open position. If, however, the die isin operation and the holder 100 is held against forward feed therewith as the thread cutting elements feed onto the work, the die body is pulled forward therewith onto the work, and an enlarged rflange portion 120 on the forward end of the y,head 110 engages the end wall portion 121 of the sleeve 65, causing this sleeve to be retracted relative to the body, holding it against forward movement with the die body, until the sleeve is `in die released or open position, as shown in Fig- .ure 17, whereupon the thread cutting elements are entirely freed fronrthework. The springs 108 then force the die body back relative to the lholder into the position shown in Figure 16 with the holder flange 120 against the outer face of the retaining ring 35.

c AIt will thus be seen that the die may be closed either by moving the sleeve 65 forwardly, or by rocking the actuating ring, as by means of the handle 70, and that when the die is closed it is ,held latched in closed position until the sleeve 65 is lmoved rearwardly relative to the die to an extent suiciently to release the latch, where- .upon furtherrearward motion of the sleeve 65 acts positively to open the die. seen that holding of the sleeve 65, or the holder Also it Will be 100, against forward movement with the die as it is Vbeing pulled onto the Work by threaded engagement of its cutting elements therewith acts to open the die and thus release it from the work.

From the foregoing description of an embodi- 4in circular series, a plurality of thread cutting element carriers each having a trunnion jourynaled in one of said openings, a ring rockable about the axis of said series operatively connected to said carriers to cause rocking of said ring to simultaneously roel: said carriers, said carriers having thread-cutting elements having their cutting portions eccentrically disposed to;

said trunnions and movable toward and from said to open or close said die on rocking of said ring in opposite directions, an element for limiting the rocking of said ring, yielding means pressing said ring toward its limited angular position, and means carrying said element for movement axially of said body, said element and ring having cooperating cam faces shaped to cause axial movement of said element in one drection to turn sald ring positively in a direction to open the die.

2. A die having a body provided with a plurality of trunnion-reoeiving openings arranged in circular series, a plurality of thread cutting element carriers each having a trunnion journaled l in one of said openings, a ring rockable about the axis of said series operatively connected to said carriers to cause rocking of said ring to simultaneously rook said carriers, said carriers having ing of said ring, yielding means pressing saidi ring toward its limited angular position, means carrying said element for movement axially of said body, said element and ring having c0- operating cam faces shaped to cause axial movement of said element in one direction to turn said ring positively in a direction to open the die, and means for adjusting said element angularly about said axis to adjust the limits of rocking of said ring.

3. A die having a body provided with a plu rality of trunnion-receivmg openings arranged in circular series, a plurality of thread cutting element carriers each having a trunnion journaled in one of said openings, a ring rocha-ble about the axis of said series operatively connected to said carriers to cause rocking of said ring to simultaneously roolc said carriers, said carriers having thread-cutting elements having their cutting portions ecoentrically disposed to said trunnions and movable toward and from said axis to open or close said die on rocking of said ring in opposite directions, an element for limiting the rocking of said ring, means carrying said elementfor movement axially of said body, said element and ring having cooperating cani faces shaped to cause axial movement of said element in one direction to turn said ring positively in a direction to open the die after an initial lost motion, means for adjusting said element angular-1y about said axis to adjust the limits of rocking of said ring and to prevent turning of said ring to open the die when said die is fully closed except after an initial axial movement of said element taking lup said lost motion in die-opening direction. ment, of this invention, which has been shown Y 4. A die having a generally cylindrical body LlOls 'whereby axial motion of said sleeve rocks said ring, said block and slot being shaped to aiiord an initial lost motion oi said block toward chaseropen position before such motion is effective to rock said ring, and cooperating during such lost motion to prevent turning of said ring toward die-open position, an adjusting ring journaled on said body and having a guideway for said block axially of said body, and means for adjusting said adjusting ring about the axis of said body.

5. A die having a generally cylindrical body provided with trunnion journal openings arranged in circular series about its axis, a plu-y rality of thread cutting element carriers each having a trunnion journaled in one of said openings, an actuating ring journaled on said body and operatively connected to said carriers to cause rocking of said ring to rock said carriers to open or close the die, a sleeve slidable axially on said body, a block connected to said sleeve to move therewith and engaging in a slot in said actuating ring angularly related to the axis of said body, whereby axial motion of said sleeve rocks said ring, said block and slot being shaped to afford an initial lost motion of said block toward Chaser-open position before vsuch motion is effective to rock said ring, and cooperating during such lost motion to prevent turning of said ring toward die-open position, an adjusting ring journaled on said body and having a guideway for said block axially of said body, and

means for adjusting said adjusting ring about the axis of said body, said sleeve enclosing said adjusting ring and having an opening through which said adjusting means is accessible for actuation.

6. A die having a generally cylindrical body provided with a plurality of trunnion journal openings arranged in circular series about its axis, a plurality of thread-cutting element carriers each having a trunnion journaled in one of said openings, each of said trunnions having'a reduced portion between its ends, a trunnion-retaining ring on said body having parts engageable in said reduced trunnion portions, said part having cut-outs movable by rocking of said retaining ring into registry with said trunnions to permit removal of said carriers, a sleeve movable axially of said body and enclosing said retaining ring and having an opening through which said retaining ring may be accessible for rocking said retaining ring, and operative connections between said sleeve and carriers for causing axial movement of said sleeve to rock said carriers to open and close the die.

'7. A die having a generally cylindrical body provided with a plurality of trunnion journal openings arranged in circular series about its axis, a plurality of thread cutting element carriers each having a trunnion journaled in one of said openings, each of said trunnions having a reduced portion between its ends, a trunnion- 'retaining ring on said body having parts engageable in said reduced trunnion portions, said part having cut-outs movable by rocking of said retaining ring into registry with said trunnions to permit removal of said carriers, an actuatingv ring journaled on said body and operatively connected to said carriers to rock said carriers between die-open and die-closed positions, an element movable axially of said body for rocking said actuating ring, means for adjusting said element about the axis of said body tov determine the limits of rocking of said actuating ring, and a sleeve movable axially of said body and enclosing said element-adjusting means, said retaining ring, and said adjusting ring and connected to said.l element. l 90 8. A die having a body, a plurality of thread cutting element carriers pivotally mounted on said body, means for rocking said carriers simultaneously to open or close the die, a spring tending to hold said die open, a latch for holding said die closed, a member movable axially of said body for releasing said latch, and means operatively connecting said member and rocking means acting on continued movement of said member in the same direction after releasing said latch to positively open said die.

9. A die having a body, a plurality of thread cutting element carriers pivotally mounted on said body, means for rocking said carriers simultaneously to open or close the die, a spring tending to hold said die open, a latch for holding said die closed, a member movable axially of said body for releasing said latch, means operatively connecting said member and rocking means acting on continued movement of said member in' the rsame direction after releasing said latch to posi- `tively open said die, and means for adjusting said latch angularly about the axis of said body to determine the limit of rocking of said carriers.

l0. A die having a body, a plurality of threadcutting element carriers -movablymounted on said body, and carrier-controlling mechanism for simultaneously moving said carriers to open or close the die, said mechanism including a member angularly adjustable about the axis of said body, a rthreaded socket in said member, an adjusting screw engaging said socket, and operative connections between said screw and body for producing such adjustment.

11. A die having a body, a plurality of thread 125 cutting element carriers movably mounted on said body, and carrier-controlling mechanism for simultaneously moving said carriers to open or close the die, said mechanism including a member angularly adjustable about the axis of said body, a threaded socket in said member, an adjusting screw engaging said socket, and operative connections including meshing rack and pinion teeth between said screw and body for producing such adjustment.

12. A die having a body, a die holder to which said body is slidably connected, means for yieldingly holding said body in one position relative to said holder, a plurality oi thread-cutting element carriers movably supported by said body to move between die open and closed positions, spring means tending to hold said carriers in open positions, a latch for holding said carriers in closed positions, means actuated by relative motion of said holder and body from one position to release said latch, and means operatively connected to said carriers acting positively to move said carriers to open positions on further. relative motion of lsaid holder and body after releasing said latch.

said body is slidably connected, means for yieldingly holding said body retracted relative to said holder, a plurality of thread-cutting element carriers movable on said body between die open and closed positions, and a member movable axially of said body operatively related to said carriers to move said carriers to closed position on movement of said member away from said holder and to move said carriers positively to open position on movement of said member in the reverse direction, said member and holder having portions engageable on movement of said body from said holder, as by the cutting elements feeding onto the work while said holder is held against axial movement to positively open said die.

14. A die having a body, a die holder to which said body is slidably connected, means for yieldingly holding said body retracted relative to said holder, a plurality of thread-cutting element carriers movable on said body between die open and closed positions, resilient means yieldingly holding said carriers in die-open position, a latch for holding said carriers in die-closed position, a member movable axially of said body and operative to release said latch on movement toward said holder and having operative connection thereto to positively open said die on further movement in the same direction, and connections between said member and holder for causing advance of said body by feed of the threadcutting elements onto the work when said holder is held from axial movement to move said member relatively to said body to release said carriers and to open the die.

15. A die comprising a body, a plurality of thread-cutting element carriers pivotally mounted on said body, a ring rockable on said body and operatively connected to said carriers for simultaneously rocking said carriers to open or close said die, a spring tending to hold said die open, said ring having a slot therein, a block having a latch face on one side and a cam face on the other engageable in said slot and cooperating with mating faces of said slot, said latch faces being held normally in contact by said spring, means for holding said block against rotation about the axis of said ring while permitting axial motion thereof, and means actuable to move said block axially of said ring to rst release said latch faces from each other and then to bring said cam faces into contact if said spring is unable to move said ring to full open position, whereby continued axial movement of said block in the same direction acts to positively move said ring to die-open position.

16. A die comprising a body portion, a plurality of thread-cutting element carriers pivotally mounted on said body, a ring rockable on said body and operatively connected to said carriers for simultaneously rocking said carriers to open or close said die, a spring tending to hold said die open, said ring having a slot therein, a block having a latch face on one side and a cam face on the other engageable in said slot and cooperating with mating faces of said slot, said latch faces being held normally in contact by said spring, means for holding said block against rotation about the axis of said ring while permitting axial motion thereof, means actuable to move said block axially of said ring to rst release said latch faces from each other and then to bring said cam faces into contact if said spring is unable to move said ring to full open position, whereby continued axial movement of. said block in the same direction acts to positively move said ring to die-open position, and means for adjusting said block-holding means angularly about the axis of said ring.

17. A die comprising a body, thread cutting elements rockably carried by said body to move thereon between die-closed and die-open positions, resilient means for rocking said elements to die-open position, a latch member for holding said elements in die-closed position, and operative connections between said latch member and said elements positively moving said elements to die-open position on continued movement of said latch after it has released said elements.

ERNEST T. BYSSHE. ROBERT R. FINN. 

